It is possible to run multiple instances of the Hurd
in parallel, on a single instance of Mach. Other than
performance ?crosstalk, they are essentially isolated.
Practically, as many devices do not allow multiple
non-?cooperating users, e.g., hard drive and network
this is not currently possible. It can be overcome,
however, by virtualizing these problematic devices.

When extra hardware is not available, it is possible to use a
sub-Hurd.

Etymology

Neighborhurd is a pun on neighborhood, and a stance against hierarchies.

Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled
GNU Free Documentation License.